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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT43USB355 датащи(PDF) 73 Page - ATMEL Corporation |
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AT43USB355 датащи(HTML) 73 Page - ATMEL Corporation |
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73 / 115 page  73 AT43USB355 2603G–USB–04/06 PortF as General Digital I/O PFn, General I/O Pin: In the AT43USB355E, after firmware downloading, the DDFn bit in the DDRF register selects the direction of this pin. If DDFn is set (one), PFn is con-figured as an output pin. If DDFn is cleared (zero), PFn is configured as an input pin. If PORTFn is set (one) when the pin is configured as an input pin, the MOS pull-up resistor is activated. To switch the pull-up resistor off, the PORTFn has to be cleared (zero) or the pin has to configured as an output pin. The Port F pins are tri-stated when a reset condition becomes active, except PFO of the AT43USB355E. This pin is dedicated as the slave select pin for the SEEPROM. Note: n: 3, 2, 1, pin number. Table 29. DDFn Bits on Port F Pins DDFn PORTFn I/O Comment 0 0 Input Tri-state (Hi-Z) 0 1 Input PFn will source current if ext. pulled low. 1 0 Output Push-Pull Zero Output 1 1 Output Push-Pull One Output |
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